The Empire Earth (Popularity: )
http://www.theempireearth.com/ A site concerned with the future of our earth. Futurist scenario building based on probability. Wake up call to take individual responsibility for the future of our earth.
Impact (Popularity: )
http://www.breadandbutterscience.com/ Provides an analysis of the threats from asteroid/comet impacts, nearby supernova events, and massive solar storm. The site also provides preparedness planning for these types of cataclysms.